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Why does my 1999 polaris sportsman 335 backfire when i let off the throttle

It backfires when i let off the throttle

Posted by Anonymous on

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Posted on Jan 02, 2017

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SOURCE: backfires at half to full throttle, idle is ok, low rpm

hi how are you

Posted on May 24, 2009

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SOURCE: Polaris Sportsman 90 - stalls

Is the choke in the on position? Have you warmed it up enough?

Posted on Sep 11, 2009

  • 38 Answers

SOURCE: 05 sportsman 700 efi engine miss

this is normal it is rev limiter you can get a kit for the overide rev limiter

Posted on Oct 01, 2009

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SOURCE: I have a 1999 polaris sportsman 335 atv and I am

carb needs work possible float or fuel/air mix valve worn

Posted on Mar 07, 2010

  • 9 Answers

SOURCE: My 1999 Polaris 335 sportsman

you have down all the electrics ( so have spark at plug ) has to be something with the carby does the spark plug have fuel on it when you remove after trying to start if not fuel problems, does bike have T.P.S (throttle positioning sensor) some on carby, some on thumb throttle etc might be causing problems.

Posted on Sep 21, 2010

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1 Answer

I have a 1998 Polaris Sportsman 500 ATV that won,t idle and backfires. Chuggs when idiling, Starts hard, even with choke. Hitting the throttle makes it die out


Could be a vacuum leak in the intake tract. Try spraying carb cleaner with the straw that come with can around the intake and carb area. If there is a leak, engine speed well change.
I

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2015 polaris sportsman 850 xp always pops and sometimes backfire when throttling.


Make sure you have the correct spark plugs and they are gapped per factory spec's. This will eliminate one possible issue...
Use these!!!

https://www.rockymountainatvmc.com/p/949/2133/NGK-Resistor-Sparkplug?v=12065

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2015 Sportsman 570 EFI won't start and will backfire after a couple of turns


does it have more than a one year warranty

strange
small back fire on an EFI system...
low km

disconnect battery terminals = reset factory default
try start again

check valve adjustment

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Oct 27, 2016 | Polaris ATV

1 Answer

My 2007 450 sportsman won.t start but she backfires


Remove the seat, and take the cover off the air filter container. Place your hand over the end to aid in fuel flow to the carburator. You might not be getting enough fuel which is causing it to backfire and not start completely.
Attempt to start the ATV once you get fuel flowing you should be all set. Clean that filter as well.

Jan 31, 2015 | Polaris 2007 Sportsman 450

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Polaris troubleshooting


a professional carb cleaning, new or CLEAN air filter and NEW spark plug!

Jul 19, 2014 | Polaris 2007 Sportsman 500 EFI

1 Answer

My 2001 sportsman 400 will not go over 20mph what should I do?


replace fuel filter. check spark plug. fuel has waste in it bad fuel maybe.. has it been setting a long time. remove sediment bowl from carb. should at least drain the carb and catch the fuel from the drain. examine fuel caught for bubbles in bottom of fuel container. air filter clean? adj timing ? does it smoke when running? backfire? choke off ?

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Engine won't idle /sometimes backfires


Check the MAF-MAP SENCER or it's a throttle position sencer is bad check both by replacing them and see if it works or the last result is idle control valve

Mar 24, 2014 | Polaris 2006 Sportsman 450

1 Answer

Idles great but open the throttle it misses and backfires


sounds like you have an air leak on the intake somewhere

Jul 12, 2017 | Polaris ATV

1 Answer

I HAVE A 1999 POLARIS 335 SPORTSMAN STARTS FINE WHEN I TRY TO ACCELERATE THE QUAD BOGS FEELS LIKE ITS GOING TO STALL BUT THEN GOES BUT NOT AT FULL POWER AFTER RELEASING GAS THERE IS A LOUD BACKFIRE ...


carbon on the plugs indicates flooding
the backfire indicates fuel being ignited in the exhaust
have the carby /fuel system professionally overhauled

May 27, 2017 | Polaris ATV

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